VS
join:2003-07-27
| reply to VS
Re: [TW] Columbus OH problems
I didn't think it would get so bad again so soon. Was offline for several hours early this morning (the screenshot of my smokeping verifies that) and continues to be intermittent - I never see a reading above 55dbmv on the upstream from the modem so it's gotta be disconnecting when it hits 56dbmv and higher. Talked to Time Warner not more than 10 minutes ago (high call volume today apparently - I could wait on hold or have them call me back in a hour) and the lady on the phone said maybe I need a booster. Thursday is the soonest they can send someone out. |
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VS
join:2003-07-27
edit:
January 6th, @09:52AM
| So the guy came today. He said they can't put a booster in an apartment. I did some googling and I think maybe they meant a CMTS when they said 'booster' which is similar to a DSLAM which would totally fix the problem I think but doesn't go inside an apartment... would be at the pole or something similar.
So now I'm stuck with intermittent cable problems and no way to fix them. I can call and complain but there's no longer any point in having anyone come out to diagnose a problem that doesn't exist when they are here and can't be fixed from inside my apartment anyway.
I wonder if my regular pattern of latency is related to the disconnect problem even though the 2 aren't happening at the same time...
I should have mentioned before, but the modem is a Motorola SB4100 if anyone cares.
I found something that I think describes my problem fairly accurately in that when I do get disconnected my modem log (once it's connected again and I can access it) is often filled with ranging failures and can't reconnect:
http://www.cisco.com/warp/public/109/max_number_cmts.html
***quote***
Another by product of excessive collisions are latency of recovery times for Cable Modems when contending for a small amount of ranging opportunities when a large number of Cable Modems are already transmitting data. The Cisco CMTS uses dynamic ranging to ensure modems will always get a chance to register, but the number of opportunities decreases as the load detected on the upstream increases to ensure we are granting the data requests.
If the upstream is excessively loaded with too many modems then it may take longer for modems to recover to online state which can impact customer satisfaction.
***snip***
Since simultaneously active subscribers are assumed to be 10% of total subscriber base, we end up with a number of around 1000 subscribers per line card. Cisco strongly recommends this number not be stretched beyond 1500 subscribers per line card, since service will be severely degraded during the busy hour. This could lead to disconnection, offline status, extremely erratic performance from the cable modem customer point of view, longer than average ranging time for modems attempting to re-register, as well as other system and performance anomalies.
***/quote***
1.06.2008 - the drops keep on...
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VS
join:2003-07-27
edit:
January 8th, @06:29PM
| My internet started dropping 1.08.08 around 1am. It was not able to reconnect and stay connected for more than one 30 minute (roughly) period in the 8 to 9 hours it was completely messed up. It was still out when the tech got here around 10:30am (from calling about another problem 2 days ago - not same day tech service) and he said the signal on the line looked fine... the 1st tech out of 6 or 7 now to actually use a line signal meter of some kind 
They gave me a new modem today and it connected just fine when the SB4100 wasn't able to 2 minutes before. Old = SB4100, New = SB5100. I've had a rock solid 44dbmv on the new modem all day so far. I got a new IP adress in the process and I had to start another smokeping :/ It's hard but I'm trying to be hopeful |
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